init

internal/http/security.go

@@ -0,0 +1,80 @@
+package httpserver
+
+import (
+	"net/http"
+	"strings"
+
+	"update_server/internal/config"
+)
+
+const contentSecurityPolicy = "default-src 'self'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; img-src 'self' data:; object-src 'none'; script-src 'self'; style-src 'self'"
+
+func securityHeaders(cfg config.Config) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			headers := w.Header()
+			headers.Set("Content-Security-Policy", contentSecurityPolicy)
+			headers.Set("Cross-Origin-Opener-Policy", "same-origin")
+			headers.Set("Cross-Origin-Resource-Policy", "same-origin")
+			headers.Set("Permissions-Policy", "camera=(), geolocation=(), microphone=()")
+			headers.Set("Referrer-Policy", "no-referrer")
+			headers.Set("X-Content-Type-Options", "nosniff")
+			headers.Set("X-Frame-Options", "DENY")
+
+			if cfg.SecureCookies {
+				headers.Set("Strict-Transport-Security", "max-age=31536000")
+			}
+
+			next.ServeHTTP(w, r)
+		})
+	}
+}
+
+func adminResponseHeaders(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		applyNoStoreHeaders(w)
+		addVaryHeader(w, "Cookie")
+		w.Header().Set("X-Robots-Tag", "noindex, nofollow")
+		next.ServeHTTP(w, r)
+	})
+}
+
+func apiResponseHeaders(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("X-Robots-Tag", "noindex, nofollow")
+		next.ServeHTTP(w, r)
+	})
+}
+
+func protectedAPIResponseHeaders(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		applyNoStoreHeaders(w)
+		addVaryHeader(w, "Authorization")
+		w.Header().Set("X-Robots-Tag", "noindex, nofollow")
+		next.ServeHTTP(w, r)
+	})
+}
+
+func applyNoStoreHeaders(w http.ResponseWriter) {
+	w.Header().Set("Cache-Control", "no-store, private, max-age=0")
+	w.Header().Set("Pragma", "no-cache")
+	w.Header().Set("Expires", "0")
+}
+
+func addVaryHeader(w http.ResponseWriter, value string) {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return
+	}
+
+	current := w.Header().Values("Vary")
+	for _, entry := range current {
+		for _, existing := range strings.Split(entry, ",") {
+			if strings.EqualFold(strings.TrimSpace(existing), value) {
+				return
+			}
+		}
+	}
+
+	w.Header().Add("Vary", value)
+}